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<div class="subTitle">org.apache.commons.io.filefilter</div>
<h2 title="Class MagicNumberFileFilter" class="title">Class MagicNumberFileFilter</h2>
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<li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
<li>
<ul class="inheritance">
<li><a href="../../../../../org/apache/commons/io/filefilter/AbstractFileFilter.html" title="class in org.apache.commons.io.filefilter">org.apache.commons.io.filefilter.AbstractFileFilter</a></li>
<li>
<ul class="inheritance">
<li>org.apache.commons.io.filefilter.MagicNumberFileFilter</li>
</ul>
</li>
</ul>
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<div class="description">
<ul class="blockList">
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<dl>
<dt>All Implemented Interfaces:</dt>
<dd><a href="http://docs.oracle.com/javase/7/docs/api/java/io/FileFilter.html?is-external=true" title="class or interface in java.io">FileFilter</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/io/FilenameFilter.html?is-external=true" title="class or interface in java.io">FilenameFilter</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a>, <a href="../../../../../org/apache/commons/io/filefilter/IOFileFilter.html" title="interface in org.apache.commons.io.filefilter">IOFileFilter</a></dd>
</dl>
<hr>
<br>
<pre>public class <span class="strong">MagicNumberFileFilter</span>
extends <a href="../../../../../org/apache/commons/io/filefilter/AbstractFileFilter.html" title="class in org.apache.commons.io.filefilter">AbstractFileFilter</a>
implements <a href="http://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></pre>
<div class="block"><p>
 File filter for matching files containing a "magic number". A magic number
 is a unique series of bytes common to all files of a specific file format.
 For instance, all Java class files begin with the bytes
 <code>0xCAFEBABE</code>.
 </p>

 <pre>
 File dir = new File(".");
 MagicNumberFileFilter javaClassFileFilter =
     MagicNumberFileFilter(new byte[] {(byte) 0xCA, (byte) 0xFE,
       (byte) 0xBA, (byte) 0xBE});
 String[] javaClassFiles = dir.list(javaClassFileFilter);
 for (String javaClassFile : javaClassFiles) {
     System.out.println(javaClassFile);
 }
 </pre>

 <p>
 Sometimes, such as in the case of TAR files, the
 magic number will be offset by a certain number of bytes in the file. In the
 case of TAR archive files, this offset is 257 bytes.
 </p>

 <pre>
 File dir = new File(".");
 MagicNumberFileFilter tarFileFilter =
     MagicNumberFileFilter("ustar", 257);
 String[] tarFiles = dir.list(tarFileFilter);
 for (String tarFile : tarFiles) {
     System.out.println(tarFile);
 }
 </pre></div>
<dl><dt><span class="strong">Since:</span></dt>
  <dd>2.0</dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/commons/io/filefilter/FileFilterUtils.html#magicNumberFileFilter(byte[])"><code>FileFilterUtils.magicNumberFileFilter(byte[])</code></a>, 
<a href="../../../../../org/apache/commons/io/filefilter/FileFilterUtils.html#magicNumberFileFilter(java.lang.String)"><code>FileFilterUtils.magicNumberFileFilter(String)</code></a>, 
<a href="../../../../../org/apache/commons/io/filefilter/FileFilterUtils.html#magicNumberFileFilter(byte[],%20long)"><code>FileFilterUtils.magicNumberFileFilter(byte[], long)</code></a>, 
<a href="../../../../../org/apache/commons/io/filefilter/FileFilterUtils.html#magicNumberFileFilter(java.lang.String,%20long)"><code>FileFilterUtils.magicNumberFileFilter(String, long)</code></a>, 
<a href="../../../../../serialized-form.html#org.apache.commons.io.filefilter.MagicNumberFileFilter">Serialized Form</a></dd></dl>
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<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/io/filefilter/MagicNumberFileFilter.html#MagicNumberFileFilter(byte[])">MagicNumberFileFilter</a></strong>(byte[]&nbsp;magicNumber)</code>
<div class="block">
 Constructs a new MagicNumberFileFilter and associates it with the magic
 number to test for in files.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/io/filefilter/MagicNumberFileFilter.html#MagicNumberFileFilter(byte[],%20long)">MagicNumberFileFilter</a></strong>(byte[]&nbsp;magicNumber,
                     long&nbsp;offset)</code>
<div class="block">
 Constructs a new MagicNumberFileFilter and associates it with the magic
 number to test for in files and the byte offset location in the file to
 to look for that magic number.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/io/filefilter/MagicNumberFileFilter.html#MagicNumberFileFilter(java.lang.String)">MagicNumberFileFilter</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;magicNumber)</code>
<div class="block">
 Constructs a new MagicNumberFileFilter and associates it with the magic
 number to test for in files.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/io/filefilter/MagicNumberFileFilter.html#MagicNumberFileFilter(java.lang.String,%20long)">MagicNumberFileFilter</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;magicNumber,
                     long&nbsp;offset)</code>
<div class="block">
 Constructs a new MagicNumberFileFilter and associates it with the magic
 number to test for in files and the byte offset location in the file to
 to look for that magic number.</div>
</td>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/io/filefilter/MagicNumberFileFilter.html#accept(java.io.File)">accept</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a>&nbsp;file)</code>
<div class="block">
 Accepts the provided file if the file contains the file filter's magic
 number at the specified offset.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/io/filefilter/MagicNumberFileFilter.html#toString()">toString</a></strong>()</code>
<div class="block">Returns a String representation of the file filter, which includes the
 magic number bytes and byte offset.</div>
</td>
</tr>
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<h3>Methods inherited from class&nbsp;org.apache.commons.io.filefilter.<a href="../../../../../org/apache/commons/io/filefilter/AbstractFileFilter.html" title="class in org.apache.commons.io.filefilter">AbstractFileFilter</a></h3>
<code><a href="../../../../../org/apache/commons/io/filefilter/AbstractFileFilter.html#accept(java.io.File,%20java.lang.String)">accept</a></code></li>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long,%20int)" title="class or interface in java.lang">wait</a></code></li>
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<a name="MagicNumberFileFilter(byte[])">
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<h4>MagicNumberFileFilter</h4>
<pre>public&nbsp;MagicNumberFileFilter(byte[]&nbsp;magicNumber)</pre>
<div class="block"><p>
 Constructs a new MagicNumberFileFilter and associates it with the magic
 number to test for in files. This constructor assumes a starting offset
 of <code>0</code>.
 </p>

 <p>
 It is important to note that <em>the array is not cloned</em> and that
 any changes to the magic number array after construction will affect the
 behavior of this file filter.
 </p>

 <pre>
 MagicNumberFileFilter javaClassFileFilter =
     MagicNumberFileFilter(new byte[] {(byte) 0xCA, (byte) 0xFE,
       (byte) 0xBA, (byte) 0xBE});
 </pre></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>magicNumber</code> - the magic number to look for in the file.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if <code>magicNumber</code> is
         <code>null</code>, or contains no bytes.</dd></dl>
</li>
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<h4>MagicNumberFileFilter</h4>
<pre>public&nbsp;MagicNumberFileFilter(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;magicNumber)</pre>
<div class="block"><p>
 Constructs a new MagicNumberFileFilter and associates it with the magic
 number to test for in files. This constructor assumes a starting offset
 of <code>0</code>.
 </p>

 Example usage:
 <pre>
 <code>MagicNumberFileFilter xmlFileFilter =
     MagicNumberFileFilter("&lt;?xml");
 </code>
 </pre></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>magicNumber</code> - the magic number to look for in the file.
        The string is converted to bytes using the platform default charset.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if <code>magicNumber</code> is
         <code>null</code> or the empty String.</dd></dl>
</li>
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<h4>MagicNumberFileFilter</h4>
<pre>public&nbsp;MagicNumberFileFilter(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;magicNumber,
                     long&nbsp;offset)</pre>
<div class="block"><p>
 Constructs a new MagicNumberFileFilter and associates it with the magic
 number to test for in files and the byte offset location in the file to
 to look for that magic number.
 </p>

 <pre>
 MagicNumberFileFilter tarFileFilter =
     MagicNumberFileFilter("ustar", 257);
 </pre></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>magicNumber</code> - the magic number to look for in the file.
        The string is converted to bytes using the platform default charset.</dd><dd><code>offset</code> - the byte offset in the file to start comparing bytes.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if <code>magicNumber</code> is
         <code>null</code> or the empty String, or <code>offset</code> is
         a negative number.</dd></dl>
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<h4>MagicNumberFileFilter</h4>
<pre>public&nbsp;MagicNumberFileFilter(byte[]&nbsp;magicNumber,
                     long&nbsp;offset)</pre>
<div class="block"><p>
 Constructs a new MagicNumberFileFilter and associates it with the magic
 number to test for in files and the byte offset location in the file to
 to look for that magic number.
 </p>

 <pre>
 MagicNumberFileFilter tarFileFilter =
     MagicNumberFileFilter(new byte[] {0x75, 0x73, 0x74, 0x61, 0x72}, 257);
 </pre>

 <pre>
 MagicNumberFileFilter javaClassFileFilter =
     MagicNumberFileFilter(new byte[] {0xCA, 0xFE, 0xBA, 0xBE}, 0);
 </pre></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>magicNumber</code> - the magic number to look for in the file.</dd><dd><code>offset</code> - the byte offset in the file to start comparing bytes.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if <code>magicNumber</code> is
         <code>null</code>, or contains no bytes, or <code>offset</code>
         is a negative number.</dd></dl>
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<h4>accept</h4>
<pre>public&nbsp;boolean&nbsp;accept(<a href="http://docs.oracle.com/javase/7/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a>&nbsp;file)</pre>
<div class="block"><p>
 Accepts the provided file if the file contains the file filter's magic
 number at the specified offset.
 </p>

 <p>
 If any <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io"><code>IOException</code></a>s occur while reading the file, the file will
 be rejected.
 </p></div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/FileFilter.html?is-external=true#accept(java.io.File)" title="class or interface in java.io">accept</a></code>&nbsp;in interface&nbsp;<code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/FileFilter.html?is-external=true" title="class or interface in java.io">FileFilter</a></code></dd>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/io/filefilter/IOFileFilter.html#accept(java.io.File)">accept</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/commons/io/filefilter/IOFileFilter.html" title="interface in org.apache.commons.io.filefilter">IOFileFilter</a></code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/io/filefilter/AbstractFileFilter.html#accept(java.io.File)">accept</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/commons/io/filefilter/AbstractFileFilter.html" title="class in org.apache.commons.io.filefilter">AbstractFileFilter</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>file</code> - the file to accept or reject.</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>true</code> if the file contains the filter's magic number
         at the specified offset, <code>false</code> otherwise.</dd></dl>
</li>
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<h4>toString</h4>
<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;toString()</pre>
<div class="block">Returns a String representation of the file filter, which includes the
 magic number bytes and byte offset.</div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/io/filefilter/AbstractFileFilter.html#toString()">toString</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/commons/io/filefilter/AbstractFileFilter.html" title="class in org.apache.commons.io.filefilter">AbstractFileFilter</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>a String representation of the file filter.</dd></dl>
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